Autolite 403 Nickel Spark Plug

Traditional nickel electrodes. Copper core improves resistance to fouling. Power tip extends further into the combustion chamber to aid in self-cleaning, reducing fouling at low rpms and pre-ignition at high speeds.

• Shell
• Thread Diameter14mm
• Thread Pitch1.25mm
• Seat TypeGasket
• Reach19mm (3/4")
• Hex Size13/16" (21mm)
• Terminal TypeRemovable Nut
• Gap.035" (0.9mm)

• Center Electrode
• MaterialNickel
• TypeStandard
• Size2.5mm
• ProjectionNon-Projected

• Ground Electrode
• MaterialNickel
• TypeStandard
• Quantity1

• Specifications
• ResistorYes
• Resistor Value5k Ohm
• Heat Range7
• Torque SpecsCast Iron: 26-29 lb. ft. Aluminum: 15-22 lb. ft.

• Part Information
• BrandAutolite
• Warranty2 Years
• Longevity30k Miles

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• 1991
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• 1990
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• 1960
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• 1959
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• 1958
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• 1957
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• 1956
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• 1955
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• 1954
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• 1953
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• 1952
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• 1951
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• 1950
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• 1949
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• 1948
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• 1947
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• 1946
  • MG
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• 1945
  • MG
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